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autonurse
User

Oct 10, 2013, 2:26 PM

Post #1 of 20 (1409 views)
PCM Sign In

Crazy I have a 1996 cavalier with 175,000 miles recently it would crank but not start. I assessed that their was no spark from any of the plug wires, the battery was fully charged. I changed the coil packs and ignition module with a used one and also the Crankshaft position sensor. I plugged my scanner in to the port but it would not link up with the vehicle. I checked all the fuses especially the cigarette lighter fuse because this one was blown one time and it would detect the pcm either. I think the pcm may be bad. at this point I had it towed to a garage to find out. but in the future is their anyway I can check to be more certain(didnt want to replace something else that may not b the problem)? thanks


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Oct 10, 2013, 4:25 PM

Post #2 of 20 (1401 views)
Re: PCM Sign In

Does the check engine light come on for bulb check when the key is first turned on?



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



autonurse
User

Oct 14, 2013, 5:27 AM

Post #3 of 20 (1365 views)
Re: PCM Sign In

I didnt really notice but I think it did


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Oct 14, 2013, 6:25 AM

Post #4 of 20 (1363 views)
Re: PCM Sign In

How about you check and see............



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



autonurse
User

Oct 18, 2013, 7:01 AM

Post #5 of 20 (1341 views)
Re: PCM Sign In

sorry it took a while to get back to you. havent had a chance to look at car. but did and no the check engine light did not come on


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Oct 18, 2013, 7:24 AM

Post #6 of 20 (1338 views)
Re: PCM Sign In

That means the computer is not even powering up. Test all your fuses using a test light with the key on.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



autonurse
User

Oct 18, 2013, 1:46 PM

Post #7 of 20 (1316 views)
Re: PCM Sign In

did that and they all were good, question what if the check engine light had come on?


Hammer Time
Ultimate Carjunky / Moderator
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Oct 18, 2013, 1:50 PM

Post #8 of 20 (1314 views)
Re: PCM Sign In

It would mean the computer is working.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



autonurse
User

Oct 21, 2013, 10:59 AM

Post #9 of 20 (1290 views)
Re: PCM Sign In

thank you


autonurse
User

Nov 7, 2013, 8:05 AM

Post #10 of 20 (1233 views)
Re: PCM Sign In

I ended up towing the car to my local repair shop i use when I am unable to fix something or dont the the equipment to do so. they determined the PCM was bad and blew due to frayed wires on the harness, they replaced the Pcm and fixed the wires(I didnot feel comfortable messing with the PCM) they called me telling me none of the warning lights on the dash will now go off. they sent it to an authorized GM dealership to reprogram the PCM but the problem still exists. any suggestions as to the issue?? thanks Shocked


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Nov 7, 2013, 9:43 AM

Post #11 of 20 (1230 views)
Re: PCM Sign In

Apparently something they did. I have no idea.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



autonurse
User

Nov 7, 2013, 12:54 PM

Post #12 of 20 (1226 views)
Re: PCM Sign In

thank you


autonurse
User

Nov 14, 2013, 11:52 AM

Post #13 of 20 (1201 views)
Re: PCM Sign In

after talking to the dealership. they tried another pcm and had that one "reflashed" or reprogrammed. the dash warning lights still remain on. they have no idea why. they state its not in the pcm at all. bottom line it is an older car and I dont want to pay alot of $ to have them try to find the problem. I am going to drive it as is and in the very near future get another car. I would like to see if I can find the problem like is it a short in the wiring? and any idea where I should start? thank you


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Nov 14, 2013, 1:31 PM

Post #14 of 20 (1197 views)
Re: PCM Sign In

Were the lights on before they changed the PCM?



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



autonurse
User

Nov 15, 2013, 7:16 AM

Post #15 of 20 (1186 views)
Re: PCM Sign In

no they werent the car was operating ok and no warning lights were on at all that is what is baffling


autonurse
User

Nov 15, 2013, 7:19 AM

Post #16 of 20 (1185 views)
Re: PCM Sign In

they did say that the cause for the pcm failing in the first place was that the wiring harness was frayed and arcing.


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Nov 15, 2013, 7:44 AM

Post #17 of 20 (1183 views)
Re: PCM Sign In

The lights were not on before and now they repaired the harness and changed the computer and all the lights are on. It needs to go right back to them to resolve the issue.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



autonurse
User

Nov 15, 2013, 8:13 AM

Post #18 of 20 (1180 views)
Re: PCM Sign In

yes that was my thought also but they are telling me they took it to a GM dealership and they dont know why either and it could cost me several hours in labor to find the issue and may never find it. to me, the car is old with high miles and not worth that kind of money but a small part feels like they should solve the issue at their expense being the problem didnt exhist until the pcm was replaced thank you for your time


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Nov 15, 2013, 8:40 AM

Post #19 of 20 (1178 views)
Re: PCM Sign In

That's a cop out because they don't know what they are doing,.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



autonurse
User

Nov 15, 2013, 8:43 AM

Post #20 of 20 (1176 views)
Re: PCM Sign In

kinda got same opinion or that they dont want to be bothered, they know i do most of my own work and only bring something to them that i am either not comfortable fixing or just dont have the means to reasonably do so. I am not a "regular" there even though my last 4 vehicles i purchased from them thank you for your opinions and time!Cool






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